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| English | Irish |
| heavy goods vehicle traffic Traffic of large motor vehicles designed to carry heavy loads | trácht fheithiclí earraí troma |
| heavy metal A metal whose specific gravity is approximately 5.0 or higher | miotal trom |
| heavy metal load The amount of stress put on an ecosystem by heavy metal pollution released into it | ualach ó mhiotal trom |
| Protocol to the 1979 Convention on Long-range Transboundary Air Pollution on Heavy Metals | Prótacal a ghabhann le Coinbhinsiún 1979 um Thruailliú Aeir Trasteorann Fadraoin ar Mhiotail Troma |